CN111007298A - Remote signaling acquisition implementation method of relay protection device with adjustable starting value - Google Patents
Remote signaling acquisition implementation method of relay protection device with adjustable starting value Download PDFInfo
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- CN111007298A CN111007298A CN201911248097.7A CN201911248097A CN111007298A CN 111007298 A CN111007298 A CN 111007298A CN 201911248097 A CN201911248097 A CN 201911248097A CN 111007298 A CN111007298 A CN 111007298A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
Abstract
The invention relates to a remote signaling acquisition implementation method of a relay protection device with an adjustable starting value, wherein an analog-to-digital converter is added between the secondary output of a photoelectric coupling device and the input of a CPU (central processing unit); the analog-to-digital converter converts the secondary output voltage of the photoelectric coupler into digital quantity and inputs the digital quantity to the CPU; the CPU compares the acquired voltage value with a positive threshold and a negative threshold, and judges whether telecommand deflection exists: when the current remote signaling output state is 0, detecting that the voltage rises and is higher than a forward threshold value, and setting the remote signaling output to be 1; when the current remote signaling output state is 1, the voltage is detected to be reduced and is lower than a negative threshold, and the output state is set to be 0. The CPU collects the output of the analog-digital converter and carries out remote signaling deflection judgment; the output has hysteresis characteristics relative to the input, and the anti-interference performance is improved; two sets of positive threshold values and negative threshold values of 110V and 220V can be set, and the threshold values are selected for use according to actual field requirements, so that the compatibility of 110V and 220V is realized.
Description
Technical Field
The invention belongs to the technical field of power grid operation and maintenance of a power system, and particularly relates to a remote signaling acquisition implementation method of a relay protection device with an adjustable starting value.
Background
Remote signaling acquisition is one of important functions of a relay protection device, and is mainly used for acquiring the input quantity in a transformer substation, and the voltage rating is generally direct current 220V or 110V. The remote signaling collection starting voltage of the relay protection device is required to be not more than 0.7 times of the rated voltage value and not less than 0.55 times of the rated voltage value. The starting power of the strong current open-close circuit related to direct tripping is not lower than 5W, and the strong current open-close circuit can bear the standard lightning wave voltage of 1.2/50 mu s of 5KV, and the surge immunity test (test pulse voltage: common mode +/-4 KV, differential mode +/-2 KV) with the test grade A, and the like.
In order to meet the requirements, the scheme that a high-power resistor is connected with a photoelectric coupling device in series is generally adopted in the industry, the starting voltage is adjusted by the resistor, the power is consumed, the capacitor and the diode play a role in filtering and protecting, the photoelectric coupling device realizes the isolation of a front-stage circuit and a rear-stage circuit, and the normal work under a surge immunity test is ensured.
In the existing photoelectric coupling device products, the transmission ratio of the amplification region of the photoelectric coupling device is not fixed, and there is a large individual difference, for example, the transmission ratio of the photoelectric coupling device TLP291 of toshiba is in the range of 50% to 400%. The difference of the transmission ratio can cause circuits with the same resistance, the starting voltage has larger difference, and the starting voltage is difficult to be ensured to be within the allowable range. Therefore, the mass production device is troublesome, the starting value of each remote signal needs to be tested, and the resistor of the loop which does not meet the requirement needs to be replaced. In some occasions, the compatibility of the rated values of 220V and 110V is realized under the condition that the circuit is not changed, and the traditional method cannot realize the compatibility. The traditional method can adjust the remote signaling acquisition starting value of the relay protection device only by adjusting hardware circuit parameters; by using the relay protection device of the traditional method, after production is finished, the resistor needs to be replaced again due to the fact that the remote signaling starting value is not appropriate; the conventional method cannot realize the compatibility of rated voltages of 220V and 110V.
Disclosure of Invention
In order to solve the technical problem, the method provides a remote signaling acquisition scheme which can realize the adjustment of the starting value without replacing a photoelectric coupling device. The technical scheme adopted by the invention is as follows:
a remote signaling acquisition implementation method of a relay protection device with an adjustable starting value comprises the following steps:
step 1, adding an analog-to-digital converter between the secondary output of a photoelectric coupler and the input of a CPU (central processing unit);
step 2, converting the secondary output voltage of the photoelectric coupler into digital quantity by the analog-to-digital converter and inputting the digital quantity to the CPU;
and 3, comparing the acquired voltage value with a positive threshold and a negative threshold by the CPU, and judging whether the telecommand deflection exists.
Preferably, the specific method for determining whether the telecommand displacement is determined in step 3 is as follows:
when the current remote signaling output state is 0, detecting that the voltage rises and is higher than a forward threshold value, and setting the remote signaling output to be 1; when the current remote signaling output state is 1, the voltage reduction is detected, and when the voltage reduction is lower than a negative threshold value, the output state is set to 0.
The telecommand acquisition is a function of the relay protection device, and the operation is an operation in which the value acquired by telecommand in the telecommand displacement is changed from 0 to 1 or from 1 to 0.
The invention has the beneficial effects that:
1) the invention adds an analog-to-digital converter between the secondary output of the photoelectric coupler and the input of the CPU, and the CPU acquires the output of the analog-to-digital converter and carries out remote signaling deflection judgment. Due to the addition of the analog-to-digital converter, the CPU can acquire the actual voltage output by the secondary side of the photoelectric coupler. When the photoelectric coupling device works in an amplifying region, the output voltage is in direct proportion to the input voltage, and the remote signaling 0 is changed into 1 when the CPU judges that the voltage is changed from low to high and is higher than a forward threshold value. Similarly, the voltage changes from high to low, and when the voltage is lower than the negative threshold, the voltage is telecommand 1 to 0.
2) The method can adjust the starting value of the telecommand deflection by adjusting two parameters of the positive threshold and the negative threshold. Meanwhile, when the remote signaling deflection is detected, a positive threshold and a negative threshold are set, and the positive threshold is larger than the negative threshold, so that the output has a hysteresis characteristic relative to the input, and the anti-interference performance is improved.
3) The invention can set two sets of positive threshold and negative threshold with rated values of 110V and 220V, and can be selected for use according to actual requirements on site, thereby realizing the compatibility of 110V and 220V.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a prior art remote signaling collection principle;
fig. 2 is a schematic diagram of a remote signaling collection principle of an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, it is a schematic diagram of a remote signaling collection principle in the prior art; fig. 2 is a schematic diagram illustrating a remote signaling collection principle according to an embodiment of the present invention. In a conventional remote signaling collection method, a secondary of a photoelectric coupler is input to an IO pin of a CPU. Because the IO pin can only read 0 or 1, the value when the state changes is the starting value, and the CPU cannot intervene.
The invention adds an analog-to-digital converter between the secondary output of the photoelectric coupler and the input of the CPU, and the CPU acquires the output of the analog-to-digital converter and carries out remote signaling deflection judgment. Due to the addition of the analog-to-digital converter, the CPU can acquire the actual voltage output by the secondary side of the photoelectric coupler. When the photoelectric coupling device works in an amplifying region, the output voltage is in direct proportion to the input voltage, and the remote signaling 0 is changed into 1 when the CPU judges that the voltage is changed from low to high and is higher than a forward threshold value. Similarly, as long as the judgment voltage is changed from high to low, when the judgment voltage is lower than the negative threshold, the remote signaling 1 is changed into 0.
The starting value of the telecommand deflection can be adjusted by adjusting two parameters of the positive threshold and the negative threshold. Meanwhile, the positive threshold is set to be higher than the negative threshold, so that the remote signaling acquisition loop has the hysteresis characteristic of output relative to input, and the anti-interference performance can be improved. The traditional scheme cannot automatically adapt to remote signaling loops with rated values of 110V and 220V under the condition of not changing circuit parameters. According to the method, two sets of positive threshold values and negative threshold values with rated values of 110V and 220V can be set, and the threshold values are selected for use according to actual field requirements, so that the 110V and 220V are compatible.
In the embodiment of the invention, the method for setting the rated values of 110V and 220V is as follows: two rated values of 110V and 220V are preset in a CPU, and the rated values of 110V and 220V are switched by a dial switch.
In the embodiment of the invention, the forward threshold value refers to a value acquired by an analog-to-digital converter corresponding to the moment when a remote signaling acquired value is changed from 0 to 1; the negative threshold is a value acquired by an analog-to-digital converter corresponding to the moment when the remote signaling acquired value is changed from 1 to 0.
The remote signaling signal with the rated value of 110V or 220V is input from the leftmost side, and the input signal enters a resistor, a capacitor, a diode and the like and is input to the primary side of a photoelectric coupling device. The secondary output of the photoelectric coupler is transmitted to an analog-to-digital converter and converted into digital quantity. The CPU collects the output result of the analog-digital converter through the data line and judges the remote signaling output state.
The method for judging the output state comprises the following steps: first, according to the set rated value of the remote signaling loop, corresponding positive threshold and negative threshold are selected and used. When the current remote signaling output state is 0, the voltage rise is detected and is higher than the forward threshold value, and the remote signaling output is set to be 1. When the current remote signaling output state is 1, the voltage is detected to be reduced and is lower than a negative threshold, and the output state is set to be 0. The positive and negative thresholds for each loop can be set individually.
Because the dispersion of the parameter of the photoelectric coupling device is large, each remote signaling loop uses independent positive threshold and negative threshold. Each remote signaling loop stores two sets of positive threshold values and negative threshold values with rated values of 220V and 110V, and corresponding threshold values are selected according to the voltage actually used on site.
The analog-to-digital converter in the embodiment of the invention can be realized by adopting the existing product.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (6)
1. A remote signaling acquisition implementation method for a relay protection device with an adjustable starting value is characterized by comprising the following steps:
step 1, adding an analog-to-digital converter between the secondary output of a photoelectric coupler and the input of a CPU (central processing unit);
step 2, converting the secondary output voltage of the photoelectric coupler into digital quantity by the analog-to-digital converter and inputting the digital quantity to the CPU;
and 3, comparing the acquired voltage value with a positive threshold and a negative threshold by the CPU, and judging whether the telecommand deflection exists.
2. A method for implementing telecommand collection according to claim 1, wherein the specific method for determining whether telecommand displacement is performed in step 3 is:
when the current remote signaling output state is 0, detecting that the voltage rises and is higher than a forward threshold value, and setting the remote signaling output to be 1; when the current remote signaling output state is 1, the voltage reduction is detected, and when the voltage reduction is lower than a negative threshold value, the output state is set to 0.
3. A method for implementing remote signaling collection according to claim 1 or 2, wherein the setting of the 110V and 220V ratings is performed by: two rated values of 110V and 220V are preset in a CPU, and the rated values of 110V and 220V are switched by a dial switch.
4. A remote signaling acquisition implementation method according to claim 1 or 2, wherein the forward threshold is a value acquired by an analog-to-digital converter corresponding to a time when a value acquired by remote signaling changes from 0 to 1; the negative threshold is a value acquired by an analog-to-digital converter corresponding to the moment when the remote signaling acquired value is changed from 1 to 0.
5. A remote signaling acquisition implementation method according to claim 4, wherein each remote signaling loop uses independent positive and negative thresholds, each remote signaling loop stores two sets of positive and negative thresholds with ratings of 220V and 110V, and the corresponding threshold is selected according to the voltage actually used on site.
6. A method as claimed in claim 5, wherein the positive threshold is set to be higher than the negative threshold.
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| CN201911248097.7A CN111007298A (en) | 2019-12-06 | 2019-12-06 | Remote signaling acquisition implementation method of relay protection device with adjustable starting value |
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| CN201911248097.7A CN111007298A (en) | 2019-12-06 | 2019-12-06 | Remote signaling acquisition implementation method of relay protection device with adjustable starting value |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113485194A (en) * | 2021-07-20 | 2021-10-08 | 北京四方继保工程技术有限公司 | Remote signaling acquisition circuit for power distribution device and control method |
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Application publication date: 20200414 |